Thomas james murphy



(No Model.)

T. J. MURPHY.

TRIPOD FOR ROCK DRILLING MACHINES.

Patented Ma 15, 188.8.

Illlll l/Vl/E/VTOR J\ )I BY ATTORNEY I lT/VESSEES:

Unirrnn STATES arniwr Orrrcn.

THOMAS JAMES MURPHY, OF NEl/V YORK, N. Y., ASSIGNOR OF ONE-IIALF TO ROGER POTTER, OF SAME PLACE.

TRlPOD FOR ROCK DRlLLlNG MACHINES.

SPECIFICATION forming part of Letters Patent No. 383,064, dated May 15,1888.

Application filed October 14, 1887.

To all whom it may concern:

Be it k now n th at I, THOMAS JAMES MURPHY, a citizen of the United States, and a resident of the city of New York, in the county and State of New York, have invented a new and useful Improvcmentin Tripods for Rock'Drilling Machines, of which the followingisaspecification. The essential features of this invention re late to improvements in the construction of the tripod, its legs, joints, and the mechanism for securing the rock-drill stock to the same.

Other features relate to details in the construction, more fully understood from the description and claims hereinafter stated. In the drawings hereto annexed, Figure 1 represents a top View of the tripod, the drillstock fastening-plate being shown turned to hold the drill-stool; while in a horizontal position. Fig. 2 is a vertical central longitudinal section of the same. Fig. 3 is a lateral vertical section centrally through the main hub, to which the legs are attached. Fig. 4 is a detached cross-section of one of the outer at tached legs and its joint. Fig. 5 is a similar lateral section at one of the inner leg-joints. Fig. 6 is a detached top view of the clampingjaw of the drill-stock fastening. Fig. 7 is a lateral vertical section of the same. Fig. 8 is a detached top view of the clamping plate or seat of the drill-stock. Fig. 9 is a detached side view of a portion of the drill-stock, to which the tripod is attached.

With the rock-drill, with a tripod constructed according to this invention, the drill-stock to secure it to the tripod is formed with a flat circular base-plate or hub having a dovetailshaped periphery, and the tripod has a dovetail stationaryjaw and a movable clampingjaw to grip the dovetail periphery of said hub or baseplate.

A represents the portion of the drillstock to which the tripod is attached, and B is the projecting dovetail shaped or flanged hub, formed, cast, or secured thereon to attach the stock to the tripod.

0 represents the stationary jaw plate or seat for the hub B. It has the dovetail seg mental projection c, to meet a portion of the periphery of the hub B.

D is the movable jaw to engage the opposite Serial No. 259,378. (No niolrl.)

portion of said hub 13. Said jaw-plate O has formed on its lower side a lateral horizontal hub, E, with a bell-shaped end, f, on each eX- tremity, and the plate 0 opposite its projection 0 is formed with a dovetail-shaped tongue, d, over which the movable jaw D is closely fitted to slide with the dovetail groove e.

In order to powerfully press the jaw D against the hub B, a screw or screw-stud, F, is employed in the direction of the sliding mo tion and through the jaw D, and passing with its threaded end into the hub E, so that by turning said screw F in one direction the jaw is forced against the hub B, and turning it in opposite direction said jaw withdraws from said hub, as clearly shown in Fig. 2. In the cavity of each bell-shaped endf is employed a closely taper-fitted journal or jointed hubs or plugs, G,which are both held into their respective bellsf by means of a screw-bolt, H, employed longitudinally and centrally through the hub E and said plugs G. Each said plug extends considerably from its bell, and upon said extending portion are employed the legconnections in manner to allow the legs to turn thereupon. I represents the central rear leg of the tripod, and J J are the two forward legs of the same. The legs J J, with their connec tion, are attached, respectively, each to the outer end of the respective plug G. The rear leg has a forked top end or cross-head, K, of which each end terminateswithaloop-shapedhead,L, fitted closely over the periphery of the plug G, and a portion, 9, from the inner periphery of said loop-head rearward is slotted to allow the head to yield. A lateral screw-bolt, M, is employed through said loop-head, by means of which the same may be contracted to more or less grip around the periphery of the plug, as clearly shown in Fig. 5.

For each leg J is employed over the portion of the plug G a loop-strap piece, N, fitted closely upon the plug and having an outwardprojecting round taper shank, 0.

Each leg J has a bellshaped head, P,which 95 is closely fitted over said taper shank O, and a radial screw-bolt, R, is employed which is secured with its head in the shank O and passes from said shank through the head 1?, as shown in Fig. 4. By means of said bolt I00 2 ssspee R the head P is caused to grip the shank 0 very tightly to prevent the leg to change position. After properly located by slacking the bolt R the leg is readily turned to put it n proper position. By means of the expanding jaw the drill-stock is very conveniently detached or attached and held solidly.

By means of the leg-joints and connection the tripod is readily adjusted to the ground and solidly held in its position.

WVhat I claim, and desire to secure by Let ters Patent, is

1. In a tripod for rockdrilling machines, the combination, with a dovetail or flanged portion on the drillstock, of a stationary jaw plate or seat provided with a dovetailsegmental projection or jaw, a dovetail tongue projecting from the opposite side of the jawplate, a movable jaw provided with a dovetail groove to receive said tongue, a horizontal hub upon the under side of the jaw-plate, a screw-bolt passing through the movable jaw and entering said hub, and supporting-legs ointed onto the hub,substantially as described.

2. In atripod for drilling-machines, the combination,with a jaw seat or plate and a horizontal hub upon the under side of the same,

provided with bell-shaped ends projecting beyond the jaw-plate, of tapered or beveled plugs or hubs seated in said bellshaped ends, a bolt extending longitudinally through the horizontal hub and plugs and locking the same in the bell-shaped ends,a forked leg provided with loop heads embracing said plugs, bolts or screws to tighten said loop-heads, aloop-strap embracing each plug and provided with an outwardlyprojecting shank, snpportingdegs, a bellshaped head upon each leg adapted to fit over the shanks upon the loop-straps, and a bolt passing through each shank and bellshaped head,whereby the same are locked together, substantially as described.

In testimony that I claim the foregoing as my invention I have signed my name, in presence of two witnesses, this 15th day of April, 1887.

THOMAS J AMES MURPHY,

Witnesses:

J OI-IN J. HAROLD, ROGER Formula. 

